Gorm “删除关联”无法正常工作

下面是根据 https://gorm.io/docs/associations.html#Delete-Associations 写的程序，想要在删除User时同时删除其Company关联，但是不成功。不确定是 docs 有误还是Delete的实现有误。

package main

import (
    "fmt"

    "gorm.io/driver/sqlite"
    "gorm.io/gorm"
    "gorm.io/gorm/clause"
)

type User struct {
    ID        int64 `gorm:"primarykey"`
    Name      string
    CompanyID int64
    Company   Company
}

type Company struct {
    ID   int64 `gorm:"primarykey"`
    Name string
}

func main() {
    db, _ := gorm.Open(sqlite.Open("file::memory:"))

    db.AutoMigrate(&User{})

    var user1 = User{
        Name:    "User1",
        Company: Company{Name: "company1"},
    }
    db.Create(&user1)

    // Neither of the following works
    db.Select("Company").Delete(&user1)
    db.Select(clause.Associations).Delete(&user1)

    var c []Company
    db.Find(&c)
    fmt.Println(c)
}

运行后输出

[{1 company1}]

从控制台输出可以看出，删除user1后，companies表中依然存在数据。

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